Sunan Ibn Majah, Book 1, Hadith 52 (In-Book) ⓘ
It was narrated that 'Abdullah bin 'Abbas said: "The Messenger of Allah said: 'Allah refuses to accept the good deeds of one who follows innovation until he gives up that innovation.'"
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ، حَدَّثَنَا بِشْرُ بْنُ مَنْصُورٍ الْخَيَّاطُ، عَنْ أَبِي زَيْدٍ، عَنْ أَبِي الْمُغِيرَةِ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " أَبَى اللَّهُ أَنْ يَقْبَلَ عَمَلَ صَاحِبِ بِدْعَةٍ حَتَّى يَدَعَ بِدْعَتَهُ " .
also referenced under: Hadith 50 (Reference) & Volume 1, Book 1, Hadith 50 (DarusSalam)